Method of making concrete units



A. G. AURAND. METHOD OF. MAKING CONCRETE UNITS. APPLICATION FILED DEC. 23. 1918.

1,336,712. Y e ed Ap 13,1920.

ARTHUR G. AURALXT 01? L03 .l-lNGELES, CALIFORNIA.

METHOD OF MAKING CONCRETE UNITS.

Specification of Letters Patent.

Patented Apr. 13, 1920.

Application filed December 23, 1918. Serial No. 288,0?8.

1 b all whom it may concern:

lie it known that I, ARTHUR G. AURAND, a citizen of the United States, residing at Los Angeles, county of Los Angeles, and State of California, have invented .a certain new and useful Method of Making Concrete Units, of which the following is a specification.

This invention relates to the manufacture of structural units and has especial reference to the production of hollow bodies for conduit purposes, specifically sewage conveyance, an object of the invention being to provide a simple, effective and speedy method of making sewer pipes from cementitious material, whereby a plurality of same may be manufactured simultaneously without disturbing the forms, and whereby a denser and stronger body may be obtained than at present.

In addition to the object mentioned, the invention contemplates the provision of an elastic form, or such a one as may be built up indefinitely within reasonable limits for making column sections, pipe sections, or for any other purpose for which hollow units made according to this invention are adaptable.

In the accompanying drawing, a sectional view, I have illustrated the elements cooperating to produce units from concrete or other suitable material in accordance with the present invention, which involves the application of cementitious material under pressure to forms prepared in an economical manner, which obviate entirely the necessity for the use of molds now commonly and exclusively used. in pipe or conduit manufacture.

The pipe sections, as well as the forms for producing same, are illustrated as hav-- ing each a bell end and a spigot end, but other forms or designs of ends, such as tongue and groove, beveled edges, and the like, are susceptible of production by this method, the illustration being merely representative.

The form consists of a plate 1, of any desired outline, thickness or dimensions, which may be designated a base, since in superposed arrangement the plates with the complementary parts of the form constitute supports for the concretionary mass applied. The base is provided on its upper face with a rabbet 2, and on its under such fastening means consists of winged nuts 5 which are tightened when the casing is in positlon, such tightening being effected from the inside, and to facilitate which the base is provided with an opening 6.

The base is also formed with a projecting ledge or shelf 7, and with a beveled or tapermg portion 8, terminating in the aforementioned rabbet 2, the ledge and beveled or tapering portion giving to the concretionary mass the desired shape. Obviously the outlines and general design of the base may be altered to produce various other forms of pipe or column sections than those shown, and particularly other forms of those portions adapted for inter-fitting with other units.

When two or more such bases with their spacing casings or envelops are arranged 'lll superposed relation as shown, cementitious material is applied preferably under pressure to the outside of the forms thus set up until a desired thickness is laid, the bell or other ends of the pipe or column sections being interiorly formed by the bases, and the exterior contour being given or built up by the skill of the artisan applying the concrete or other material.

Suitable reinforcing, may be used to strengthen the finished concrete products or they may be left plain according to requirements of use.

Within reasonable limits, a great number of these forms may be erected, the rabbets 3 and the edges or shelves 7 constituting the lines of division between each unit 9 of con crete structure, which is readily removed after setting by lifting the single units from the bases with the envelops or casings still contained therein, and thereupon releasing the winged nuts and contracting the casings, whereby to facilitate their removal from the finished products.

It will be apparent from the above that concrete units, specifically pipe and column sections, are built or manufactured in a vertical manner without molds by the use of an elastic form which may serve for the making of one or aplurality of units, as de sired.

What I claim, is

1. The method of making hollow units from concrete or other material, which consists in setting up two bases having the shape and contour required for the end of the units, spacing the bases a required distance With a casing, and then applying concrete under pressure to the outside of the bases and casing until a desired thickness is laid.

2. The method of making pipe or column sections, Which consists in setting up in superposed relation a plurality of bases spaced by suitable casings, and applying concrete under pressure to the outside of the casing and the bases, Which latter divided the finished products.

3. The method of making pipe or column sections Which consists in erecting a plurality of elastic forms comprising bases and cooperating casings spacing and engaging the bases, the bases formed With means to divide the pipe sections, and then applying concrete to the form thus erected until a desired thickness is laid.

In testimony whereof I have set my hand in the presence of tWo Witnesses.

ARTHUR G. AURAND.

WVitnesses:

HENRY E. SToRRs, ANTON GLOETZNER, Jr. 

